Layout of thin catadioptric system and mounting impact analysis of its metal primary mirror
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摘要: 对于含口径80 mm 的高次非球面金属主镜、主镜顶点到像面距离仅为17.5 mm 的薄型折反式光学系统，设计了带3 安装耳的主镜，并利用组件合并及周向同环交错前向安装的方式，在保证所有光机件顺利布局的基础上，有效增加了主镜镜体厚度提高了结构刚度。为分析金属主镜在安装应力下的面形，利用ANSYS 预紧力单元模拟螺钉连接的预紧力，在模态校核的基础上分析了主镜柔性支撑环板在不同厚度以及安装面不平时的波面变形。提出的轴向受限的主镜组件结构方案、安装应力变形的集成分析方法及解决方案，为提高主镜的装配面形精度以保证光学系统的成像质量提供了光机设计参考。Abstract: The thin catadioptric system included a metal high-order aspherical primary mirror having an 80 mm aperture, and the distance between the optical vertex of primary mirror and the image interface was only 17.5 mm. To assure the layout of all components successfully and meanwhile thicken the mirror body effectively to enhance the stiffness, the primary mirror with 3 mounting ears was designed, and measures of components combination and crisscross mounting frontward in the same circumferential ring were implemented. Moreover, to evaluate the surface figure of metal mirror under mounting stress，bolt pretension was simulated by using the pretension element in ANSYS, and on the basis of modal check, primary mirror models including flexural supporting structure of different thickness were built and wavefront deformation at mounting state was analyzed. Meanwhile, the instance of flatness diversity of mounting interfaces was considered. The schemes of mirror assembly structure with restricted axial distance, the integrated analysis way of mounting stress simulation on wavefront deformation, and measures to decrease the distortion provide the reference on the optomechanical design to increase the mirror surface accuracy after assembling thus assuring the system image quality.
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Key words:
- thin catadioptric system /
- metal mirror /
- mounting stress analysis
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